Student Electrophorus Prong_2 4 inches and mount on

4 inches and mount on a swivel boss head fitting rods up to 18mm

Wooden fulcrum-balance simple-machine model with a sliding pivot

Two pith balls suspended on unspun silk from a brass pillar

Polyhedral 120mL glass alcohol lamp ships with a metal cap and fiber wick for low-temperature bench heating in chemistry and biology demonstrations

the thinnest gauge for mounting the smallest and most delicate insect specimens in permanent displays

Student Electrophorus Prong_2 4 inches and mount onStudent sized electrophorus with a 15cm plastic charge plate and a metal disc on an insulated handle, used to demonstrate charging by induction and repeated transfer of charge.